WASHINGTON (CNN) - Democratic Rep. Sherrod Brown is ahead in his bid to unseat Sen. Mike DeWine, R-Ohio, according to a new Columbus Dispatch poll. Brown leads DeWine 47 percent to 42 percent, a slightly tighter race than in July, when a Dispatch Poll had Brown with an eight-point lead. The poll, released Sunday, surveyed 1,791 registered voters between September 9 and 22 and has a margin of error of plus or minus 2.2 percent.